Touch Display Gate Driving Circuit with Grouped Dummy Stage Control
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Solution Overview
Problem
The layout of signal lines in touch display devices is complicated by the presence of dummy stage circuits, increasing the bezel area due to the need for additional signal lines to control these circuits, especially in high-touch sensitivity modes.
Innovation Solution
The dummy stage circuits in the gate driving circuit are divided into groups, with group control signal lines and individual control signal lines disposed along the bezel area, simplifying the layout by connecting dummy start and off signal lines based on these groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If dummy stage circuits are added to hold scan signals during touch driving periods in LHB mode, then touch sensitivity is improved, but the layout of signal lines becomes complicated and bezel area increases
Solution Approach 1:
The dummy stage circuits are divided into multiple groups, with each group controlled by shared control signal lines. This segmentation allows multiple dummy stages to be controlled using fewer signal lines, reducing layout complexity while maintaining the ability to hold scan signals during touch driving periods for high touch sensitivity.
Solution Approach 2:
Shared control signal lines are designed to control multiple dummy stage circuits simultaneously. These universal control lines serve multiple functions by managing groups of dummy stages, thereby reducing the total number of signal lines required and simplifying the overall layout without compromising the touch sensitivity enhancement provided by the dummy stages.
2Measurement precision
If dummy stage circuits are added to hold scan signals during touch driving periods in LHB mode, then touch sensitivity is improved, but bezel area increases due to additional signal lines
Solution Approach 1:
By segmenting dummy stage circuits into groups and using shared control signal lines for each group, the number of signal lines required is reduced. This segmentation strategy minimizes the space needed for signal line routing in the bezel area while preserving the touch sensitivity benefits of having multiple dummy stages.
Solution Approach 2:
Universal control signal lines that can control multiple dummy stages simultaneously reduce the total signal line count. This multi-functionality approach decreases the bezel area required for signal line accommodation while maintaining the ability to enhance touch sensitivity through proper scan signal holding during touch driving periods.
3Adaptability or versatility
If multiple dummy stage circuits are positioned in the gate driving circuit, then touch driving operation is enabled during multiple LHB periods, but the number of signal lines increases
Solution Approach 1:
Dummy stage circuits are organized into groups, with each group managed by dedicated control signal lines. This segmentation enables versatile touch driving operations across multiple LHB periods while controlling the number of signal lines by sharing control resources among grouped dummy stages.
Solution Approach 2:
Control signal lines are designed with universal functionality to manage multiple dummy stage circuits. This approach enables adaptable touch driving operations during multiple LHB periods without a proportional increase in signal line quantity, as each control line can serve multiple dummy stages through group-based control.
Data Source
AI summary
A touch display device, a display panel, and a gate driving circuit are disclosed. A touch display device comprises a display panel having subpixels, a gate driving circuit including gate stages for applying a scan signal to the display panel through gate lines and dummy stages selectively disposed between the gate stages, and a touch driving circuit applying a touch driving signal to the display panel through touch lines and receiving a touch sensing signal generated by the display panel, wherein the dummy stages are divided into two or more dummy stage groups, and wherein a group control signal line for applying a group control signal based on dummy stage group and an individual control signal line for applying an individual control signal to each dummy stage included in the dummy stage group are disposed along a bezel area.